Synthesis and optical characterization of SrHfO3:Ce and SrZrO3:Ce nanoparticles
Synthesis and optical characterization of SrHfO3:Ce and SrZrO3:Ce nanoparticles
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DOI：
10.1016/j.optmat.2007.05.032
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发表时间：
2008-03-01
影响因子：
3.9
通讯作者：
Viana, B.
中科院分区：
文献类型：
--
作者：
Retot, H.;Bessiere, A.;Viana, B.
纳米粒子最近在不同的领域得到了应用，如成像(发光纳米传感器)，或用于生产激光或闪烁透明陶瓷。这项工作与这最后一个领域有关，以医学成像(正电子发射断层成像)为目标。研究了特别适合于这种应用的超致密稀土掺杂混合氧化物：SrZrO_3：Ce和SrHfO_3：Ce。这些材料的相变和非常高的熔点(分别为2646摄氏度和2730摄氏度)促使我们研究它们作为纳米颗粒的合成。使用燃烧方法，我们在低于1000℃的温度下获得了尺寸非常小(10-100 nm)的无杂质颗粒。首次描述了在纳米粉末上实现的钙钛矿基质中Ce离子的光学性质(吸收、发射和寿命)：这两种化合物在UY照射下都观察到了430 nm的发射，衰减时间很短；因此，这些燃烧制备的粒子是有趣的陶瓷闪烁体的前体。(C)2007 Elsevier B.V.保留所有权利。
Nanoparticles have recently found application fields in various scopes, such as imaging (luminescent nanosensors), or for the production of laser or scintillating transparent ceramics. This work is related to this last field, with the target of medical imaging (positron emission tomography). Very dense rare earth doped mixed oxides were studied: SrZrO3:Ce and SrHfO3:Ce, which are particularly adapted to this application. The phase transformations and the very high melting points of these materials (respectively 2646 degrees C and 2730 degrees C) led us to study their synthesis as nanoparticles. Using the combustion method we have obtained, at temperatures less than 1000 degrees C, particles of very small dimensions (10-100 nm) without impurities. First characterization of the optical properties (under UV irradiation) of the cerium ion in these perovskite matrixes, realized on the nanopowders (absorption, emission and lifetime of the cerium ion), is presented here: for both compounds, an emission at 430 run is observed under UY irradiation, with a short decay time; these particles prepared by combustion are thus interesting precursors for ceramic scintillators. (c) 2007 Elsevier B.V. All rights reserved.